package com.meida.module.bus.provider.executor;


import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
 
/**
 * 配置线程池
 * @author chenwx
 *
 */
@Configuration
@EnableAsync
public class ExecutorConfig {
	
	/** 核心线程数 */
	@Value("${threadpool.core-pool-size:10}")
	private int corePoolSize;
	/** 最大线程数 */
	@Value("${threadpool.max-pool-size:20}")
	private int maxPoolSize;
	/** 队列大小 */
	@Value("${threadpool.queue-capacity:1000}")
	private int queueCapacity;
	/** 空闲的多余线程最大存活时间 */
	@Value("${threadpool.keep-alive-seconds:600}")
	private int keepAliveSeconds;
	
	@Bean
    public Executor asyncServiceExecutor() {

        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //配置核心线程数
        executor.setCorePoolSize(corePoolSize);
        //配置最大线程数
        executor.setMaxPoolSize(maxPoolSize);
        //配置队列大小
        executor.setQueueCapacity(queueCapacity);
        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix("async-service-");
        //配置空闲的多余线程最大存活时间
        executor.setKeepAliveSeconds(keepAliveSeconds);
        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        //执行初始化
        executor.initialize();
        return executor;
    }
 
 
}